<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>col标签</title>
</head>
<body>
<table border="1">
    <col style="background-color: #939"/>
    <col span="2" style="background-color: #9c3"/>
    <col style="background-color: #f99"/>
        <td>单元格</td><td>单元格</td><td>单元格</td><td>单元格</td>
    </tr>
    <tr>
        <td>单元格</td><td>单元格</td><td>单元格</td><td>单元格</td>
    </tr>
</table>
</body>
</html>